Introduction
Redux Toolkit (RTK) has become a popular choice for managing application state in React projects. But managing data fetching logic within Redux often involves writing boilerplate code. Enter RTK Query: an optional add-on for RTK that simplifies data fetching and caching.
What is RTK Query?
RTK Query is a powerful tool designed to streamline data fetching and caching in your React applications. It leverages the core functionalities of RTK, like createSlice
and createAsyncThunk
, to automate common data fetching tasks. This eliminates the need for manual code related to:
- Making API requests
- Handling response parsing
- Caching data
- Managing loading states
Benefits of Using RTK Query
- Reduced Boilerplate: RTK Query automates much of the data fetching logic, freeing you to focus on component logic and UI.
- Built-in Caching: Data is automatically cached, improving performance by reusing previously fetched data.
- Automatic Request Deduplication: RTK Query ensures only one request is made for the same data, even if multiple components request it simultaneously.
- React Hooks: RTK Query generates React hooks that encapsulate data fetching and provide convenient access to data and loading states within your components.
- TypeScript Support: RTK Query is fully written in TypeScript, offering excellent type safety and developer experience.
Getting Started with RTK Query: A Code Example
Here's a basic example demonstrating how to use RTK Query to fetch a list of posts:
import { createSlice, configureStore } from '@reduxjs/toolkit';
import { fetchBaseQuery } from '@reduxjs/toolkit/query/react';
const initialState = { posts: [], loading: false };
const postsSlice = createSlice({
name: 'posts',
initialState,
reducers: {},
extraReducers: (builder) => {
builder
.addQuery('fetchPosts', async () => {
// Simulate API call
return await new Promise((resolve) => setTimeout(() => resolve([{ id: 1, title: 'Post 1' }], 1000)));
})
},
});
export const store = configureStore({
reducer: {
posts: postsSlice.reducer,
},
middleware: (getDefaultMiddleware) =>
getDefaultMiddleware().concat(fetchBaseQuery()),
});
// Accessing data and loading state in your component
import { useGetPostsQuery } from './postsSlice';
function PostsList() {
const { data, isLoading } = useGetPostsQuery();
return (
<div>
{isLoading ? (
<p>Loading posts...</p>
) : (
<ul>
{data.map((post) => (
<li key={post.id}>{post.title}</li>
))}
</ul>
)}
</div>
);
}
In this example, the fetchPosts
query is defined within the postsSlice
using builder.addQuery
. RTK Query automatically generates a useGetPostsQuery
hook that can be used in your components to access the fetched data and loading state.
Comparison with Tanstack React-Query
Both RTK Query and Tanstack React-Query are popular solutions for data fetching in React applications. Here's a brief comparison:
Feature | RTK Query | Tanstack React-Query |
---|---|---|
Integration | Integrates seamlessly with Redux Toolkit | Standalone library |
Caching | Built-in caching with customizable options | Built-in caching with customizable options |
Mutation Handling | Requires separate mutation definitions | Built-in mutation handling |
TypeScript Support | Fully written in TypeScript | Fully written in TypeScript |
Documentation & Community | Extensive documentation and active community | Extensive documentation and active community |
Choosing Between RTK Query and React-Query
The choice between these libraries depends on your project setup and preferences. Here are some factors to consider:
- Redux Usage: If you're already using Redux Toolkit, RTK Query offers a tightly integrated solution with minimal additional setup.
- Mutation Handling: If your application requires frequent mutations, React-Query might be a better choice due to its built-in mutation handling.
- Standalone Library Preference: If you prefer a standalone library for data fetching, React-Query is a strong option.
Conclusion
RTK Query is a powerful addition to the Redux Toolkit ecosystem, simplifying data fetching and caching for React applications. It offers a streamlined approach with built-in data caching and other advanced features.
Resources
- Redux RTK Query
- react-query aka Tanstack Query
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